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fpga: mgr: separate getting/locking FPGA manager

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Previously when the user gets a FPGA manager, it was locked
and nobody else could use it for programming.

This commit makes it straightforward to save a reference to an
FPGA manager and only lock it when programming the FPGA.

Add functions that get an FPGA manager's mutex for exclusive use:
* fpga_mgr_lock
* fpga_mgr_unlock

The following functions no longer lock an FPGA manager's mutex:
* of_fpga_mgr_get
* fpga_mgr_get
* fpga_mgr_put

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Tull 2017-11-15 14:20:13 -06:00 • committed by Greg Kroah-Hartman
parent 5cf0c7f650
commit ebf877a51a
4 changed files with 77 additions and 27 deletions
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3
include/linux/fpga/fpga-mgr.h
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@ -155,6 +155,9 @@ void fpga_image_info_free(struct fpga_image_info *info);
int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info);
int fpga_mgr_lock(struct fpga_manager *mgr);
void fpga_mgr_unlock(struct fpga_manager *mgr);
struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
struct fpga_manager *fpga_mgr_get(struct device *dev);